ARM: s3c: i2c: add platform_device forward declaration

A recent cleanup to the mach-osiris.c file is causing build errors
because the i2c-s3c2410.h header file is included before we see
the definition for platform_device. The fix is to make the header file
more robust against inclusion from other places. While this should
normally go through the i2c tree, the bug only exists in arm-soc
at the moment, so it's easier to fix it there before it goes upstream.

Without this patch, building s3c2410_defconfig results in:

arch/arm/mach-s3c24xx/mach-osiris.c:34:0:
include/linux/platform_data/i2c-s3c2410.h:37:26: warning: 'struct platform_device' declared inside parameter list [enabled by default]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-i2c@vger.kernel.org
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>

include/linux/platform_data/i2c-s3c2410.h

@@ -15,6 +15,8 @@
 
 #define S3C_IICFLG_FILTER	(1<<0)	/* enable s3c2440 filter */
 
+struct platform_device;
+
 /**
  *	struct s3c2410_platform_i2c - Platform data for s3c I2C.
  *	@bus_num: The bus number to use (if possible).